I am 3 days late on my period with clear, almost white discharge. Freaking out!!

I am 3 days late on my period. I have been EXTREMELY tired for the past 5 days. I have also been feeling nauseous/ had acid reflux burps after I eat for about a week. I’m very bloated and constipated. I’ve cried several times over small things. I have clear/ white discharge right now. I did have the tiniest amount of clear with a slightest hint of brown discharge this morning but it’s not my normal spotting. Could I be pregnant? I’m so scared to get my hopes up and it turns out I’m not. So many thoughts. I just need to know when I should test and tips to help me calm down